▎ 摘　　要

NOVELTY - A graphene oxide sample preparing method involves adding graphene oxide to a solvent for dispersion to obtain a first dispersion, coating the first dispersion on a substrate, drying the coated substrate and separating graphene oxide film from the substrate. USE - Method for preparing graphene oxide sample. ADVANTAGE - The method enables avoiding the exfoliation caused by the inhomogeneous formation of the graphene oxide, and protecting the instrument and the uniformity of the surface of the sample so as to improve the stability of the graphene oxide XPS test result, which is worthy of promotion by the XPS detection of the graphene oxide sample preparation method. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for detecting graphene oxide (2) a method for operating the sample preparation device.